Hi Kiyoshi,
Kiyoshi Ueda wrote:
Hi Hannes,
[ .. ]
Suspend was broken.
dm_suspend() recognized that suspend completed while some requests
were still in flight. So we could swap/free the in-use table while
there was in_flight request.
The patch is like the attached one, although it is not finalized and
I'm testing now.
I'll post an updated patch-set including the attached patch
this week or next week.
---
drivers/md/dm.c | 236 ++++++++++++++++++++++++++++++++++----------------------
1 file changed, 144 insertions(+), 92 deletions(-)
Index: 2.6.29-rc2/drivers/md/dm.c
===================================================================
--- 2.6.29-rc2.orig/drivers/md/dm.c
+++ 2.6.29-rc2/drivers/md/dm.c
@@ -701,11 +701,17 @@ static void free_bio_clone(struct reques
}
}
-static void dec_rq_pending(struct dm_rq_target_io *tio)
+/*
+ * XXX: Not taking queue lock for efficiency.
+ * For correctness, waiters will check that again with queue lock held.
+ * No false negative because this function will be called everytime
+ * in_flight is decremented.
+ */
+static void rq_completed(struct mapped_device *md)
{
- if (!atomic_dec_return(&tio->md->pending))
+ if (!md->queue->in_flight)
/* nudge anyone waiting on suspend queue */
- wake_up(&tio->md->wait);
+ wake_up(&md->wait);
}
Hmm. Don't think that's a good idea. Either take the spinlock here or
in_flight should be atomic.
Apart from this I'll give it a shot.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)
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